Nicotinamide N-oxide (Nicotinamide 1-oxide) is recognized as an in vivo metabolite of nicotinamide which is a precurser of nicotinamide-adenine dinucleotide (NAD+) in animals. The enzyme that catalyzes the reduction of nicotinamide N-oxide to nicotinamide in the liver is xanthine oxidase.

Monomethyl fumarate is a potent agonist of GPR109A .

Clofibric acid (Chlorofibrinic acid) is an antilipemic agent that is the biologically active metabolite of CLOFIBRATE.

4-Methylamino antipyrine, an active metabolite of Metamizole, a pyrazolone non-steroidal anti-inflammatory drug (NSAID) that inhibits COX, possesses analgesic, antipyretic, and relatively weak anti-inflammatory properties.

Oseltamivir acid (GS4071) is a potent influenza virus neuraminidase inhibitor and the prodrug of GS4071.

Nortriptyline hydrochloride (ELF-101 hydrochloride) is a metabolite of AMITRIPTYLINE that is also used as an antidepressive agent. Nortriptyline is used in major depression, dysthymia, and atypical depressions.

DP-1 hydrochloride is a degradation product of SDC-TRAP-0063, a fragment of Ganetespib, a heat shock protein 90 (HSP90) inhibitor with antitumor activity.

3-Methoxytyramine hydrochloride (3-O-methyl Dopamine hydrochloride) is an inactive metabolite of dopamine which can activate trace amine associated receptor 1 (TAAR1). 3-methoxytyramine can be found primarily in human brain and most tissues tissues; and in blood, cerebrospinal fluid (csf) or urine. Within a cell, 3-methoxytyramine is primarily located in the cytoplasm.